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ELECTRIC PENCIL SHARPENER WITH A REPLACEABLE CUTTER ASSEMBLY - Patent

Pencil-Sharpener. - The Portal to Texas History

Pencil-Sharpener. - The Portal to Texas History

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Patent US7699082 - Electric multi-pencil sharpener - Google Patents

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Patent US8205649 - Cutter assembly and electric pencil sharpener

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Patent US3678975 - Electric pencil sharpener - Google Patents

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Patent US20070251105 - Electric pencil sharpener - Google Patents